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Microcomputer that cooperates with an external apparatus to be driven by a drive signal

a microcomputer and drive signal technology, applied in the field of microcomputers, can solve the problems of large large amount of power consumption of the microcomputer, and noise canceling process, etc., and achieve the effect of reducing power consumption, excellent noise-free characteristic, and reducing power consumption

Inactive Publication Date: 2006-01-10
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]An object of the present invention is to reduce power consumption of a microcomputer.
[0010]Another object of the present invention is to reduce power consumption of a microcomputer with a structure which may be employed rather easily. The other object of the present invention is to reduce power consumption of a microcomputer through a structure which may be realized at a low cost.
[0011]It is still another object of the present invention to provide a microcomputer which implements a timer function with lower power consumption.

Problems solved by technology

However, such timer process essentially requires continuous measurement of time which results in large power consumption of the microcomputer.
However, such continuous monitor of signal level with the microcomputer requires a large amount of power consumption of this microcomputer.
Moreover, for the monitoring of signal level, a noise canceling process also requires a large amount of power consumption.
Therefore, power consumption of a microcomputer increases during such preparation period.
For example, in the case of an ECU which will be loaded to a vehicle, since a battery is not charged when an engine stops, such ECU with a microcomputer which requires a large amount of power consumption usually exhausts a battery.

Method used

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  • Microcomputer that cooperates with an external apparatus to be driven by a drive signal
  • Microcomputer that cooperates with an external apparatus to be driven by a drive signal
  • Microcomputer that cooperates with an external apparatus to be driven by a drive signal

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Experimental program
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first embodiment

[0059]The microcomputer 2 comprises an intermittent operation control section 150 and a level detecting circuit 170. The intermittent operation control section 150 is structured to input a rise request WD from the level detecting circuit 170 in addition to the intermittent operation control section 150 of the The level detecting circuit 170 operates depending on a command from the CPU 3 to perform, for every constant period, the process to read the signal level via an I / O port 70 from a terminal of the microcomputer 2. The intermittent operation control section 150 and level detecting circuit 170 operate by receiving a sub-clock which is always generated from a sub-oscillation circuit 19. The level detecting circuit 170 corresponds to the automatic signal reading means and the oscillation control section 11 and intermittent control section 150 correspond to a timer rise control means.

[0060]The CPU 3 can stop the operation thereof by executing a particular operation stop instruction...

third embodiment

[0087]A third embodiment will be explained with reference to FIG. 9 and FIG. 10. The elements similar to those of above embodiments are designated by the like reference numerals. In FIG. 10, an ECU 100 provided with a communication function comprises the one-chip type microcomputer 2 and an external apparatus 50 including the communication function. The microcomputer 2 is provided, in addition to the elements of above embodiments, with an intermittent operation control section 151 for intermittently operating the CPU 3 and a timer interlocking control section 120 for outputting a drive signal RQ to the external apparatus 50 conforming to an instruction from the CPU 3. An oscillation control section 110, the intermittent operation control section 151 and timer interlocking control section 120 are operated by receiving a sub-clock which is always generated from the sub-oscillation circuit 19. The CPU 3 outputs, with a stop means 3n, the operation command SD to the intermittent operati...

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PUM

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Abstract

A microcomputer comprises an intermittent operation control section for intermittently operating a CPU. Moreover, the microcomputer comprises a timer block, a level detecting circuit or a timer interlocking control section as the circuits for assisting operation of the CPU. The CPU realizes a timer function with the timer block. The CPU can start the process in response to a level of an external signal with the level detecting circuit. The CPU can start operation with the timer interlocking control section after an external apparatus is driven. With the structure explained above, power consumption of the microcomputer is reduced.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based on Japanese Patent Applications No. 2000-402422 filed on Dec. 28, 2000, No. 2000-402423 filed on Dec. 28, 2000 and No. 2000-402425 filed on Dec. 28, 2000 the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a microcomputer.[0004]2. Description of the Related Art[0005]As an electronic control unit (ECU) utilizing a microcomputer, there is provided a unit of the same type which executes the predetermined processes after a constant time has passed from the predetermined time. Measurement of such constant time is called a timer process, while a function including the timer process which is executed by the microcomputer is called a timer function. For example, such function may be realized by an ECU which executes necessary communication with a communication partner after the predetermined time has passed from transmi...

Claims

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Application Information

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IPC IPC(8): G06F1/30G06F1/04G06F1/32
CPCG06F1/3203G06F1/3228G06F9/30083G06F1/3243Y02B60/1239Y02D10/00
Inventor FUJITA, YOICHINITTA, SHUICHISENOO, SHINICHISAITO, YASUAKI
Owner DENSO CORP